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Selection for root dry matter percen...

Kilusi, Kiala N'G. Wa-Se.

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Selection for root dry matter percentage and associated traits in cassava (Manihot esculenta Crantz).

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Selection for root dry matter percentage and associated traits in cassava (Manihot esculenta Crantz)./
作者:	Kilusi, Kiala N'G. Wa-Se.
面頁冊數:	125 p.
附註:	Source: Dissertation Abstracts International, Volume: 53-08, Section: B, page: 3850.
Contained By:	Dissertation Abstracts International53-08B.
標題:	Agriculture, Agronomy. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9300840

Selection for root dry matter percentage and associated traits in cassava (Manihot esculenta Crantz).
Kilusi, Kiala N'G. Wa-Se.

Selection for root dry matter percentage and associated traits in cassava (Manihot esculenta Crantz). - 125 p.

Source: Dissertation Abstracts International, Volume: 53-08, Section: B, page: 3850.

Thesis (Ph.D.)--Cornell University, 1992.

Dry matter in cassava (Manihot esculenta Crantz) is a common determinant of culinary quality and marketing value. While improving cassava for higher fresh root weight, problems with lower dry matter content have been encountered. Breeding genotypes with high dry matter and high fresh root weight may increase acceptability of improved cultivars and increase farmers' income. Objectives of this study were to: (1) determine whether genetic variation for dry matter and associated traits exists among genotypes, (2) understand Genotype x Environment interaction and genotype adaptation to a wide range of environments, (3) estimate broad and narrow-sense heritabilities for dry matter and associated traits.Subjects--Topical Terms:

1018679
Agriculture, Agronomy.

Selection for root dry matter percentage and associated traits in cassava (Manihot esculenta Crantz).
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100 1 $a Kilusi, Kiala N'G. Wa-Se. $3 1912465
245 1 0 $a Selection for root dry matter percentage and associated traits in cassava (Manihot esculenta Crantz).
300 $a 125 p.
500 $a Source: Dissertation Abstracts International, Volume: 53-08, Section: B, page: 3850.
500 $a Adviser: W. R. Coffman.
502 $a Thesis (Ph.D.)--Cornell University, 1992.
520 $a Dry matter in cassava (Manihot esculenta Crantz) is a common determinant of culinary quality and marketing value. While improving cassava for higher fresh root weight, problems with lower dry matter content have been encountered. Breeding genotypes with high dry matter and high fresh root weight may increase acceptability of improved cultivars and increase farmers' income. Objectives of this study were to: (1) determine whether genetic variation for dry matter and associated traits exists among genotypes, (2) understand Genotype x Environment interaction and genotype adaptation to a wide range of environments, (3) estimate broad and narrow-sense heritabilities for dry matter and associated traits.
520 $a Two experiments were conducted at the International Institute of Tropical Agriculture, Ibadan, Nigeria between 1987 and 1991. The first consisted of 9 cassava genotypes planted at four locations during two cropping seasons and the second comprised 16 parental clones and their half-sib families planted at 3 locations for one cropping season. A randomized, complete block design with 4 replicates was used in each experiment. Dry matter, fresh root weight, total number of tubers, disease incidence and pest attack were measured 12 months after planting. Dry matter yield and starch content were computed from the corresponding measured traits. Variance components were used to estimate genetic effects, broad-sense heritability, theoretical variance of a genotype mean and G x E interactions. Parent-offspring regression was computed to estimate narrow-sense heritability for dry matter. Shukla stability-variance parameters and Additive Main Effect and Multiplicative Interaction were used to predict genotype performance in different environments.
520 $a Genotypes were influenced by G x E interaction, especially by G x L interaction. It is difficult to breed simultaneously for increased dry matter and fresh root weight. Breeding for each trait separately may result in more rapid progress from selection. Stability was sacrificed when selection was based solely on dry matter. It is not efficient to evaluate half-sib families for dry matter in many locations. It is possible to improve dry matter and associated traits by simple phenotypic selection or by half-sib progeny test.
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790 1 0 $a Coffman, W. R., $e advisor
790 $a 0058
791 $a Ph.D.
792 $a 1992
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9300840